Drive unit for a track-laying vehicle

ABSTRACT

The invention concerns a drive unit for a tracked vehicle with a first and a second electric generator ( 6, 8 ) and with a first and a second internal combustion engine ( 10, 12 ), such that one generator ( 6, 8 ) can be driven respectively by one combustion engine ( 10, 12 ), and with electric drive motors ( 14, 16, 18, 20 ) for driving a right-hand and a left-hand drive track ( 4, 2 ). According to the invention it is proposed that the elements of the drive unit are linked in such manner that the right-hand drive track ( 4 ) is associated with first and second right-hand electric drive motors ( 14, 16 ), the left-hand drive track ( 2 ) is associated with first and second left-hand electric drive motors ( 18, 20 ), the two first drive motors ( 14, 18 ) being fed by the first generator ( 6 ) and the two second drive motors ( 16, 20 ) being fed by the second generator ( 8 ). Due to the wiring of the energy paths according to the invention, very great operational security is achieved even when the drive unit is partially damaged.

[0001] The invention concerns a drive unit for a tracked vehicle according to the pre-characterizing portion of the principle claim.

[0002] In tracked vehicles, especially ones used for military purposes, the drive unit is required to be extremely reliable. Even if the vehicle is partially damaged, it must be guaranteed that the vehicle can be moved out of a danger zone without outside help.

[0003] In electrically driven tracked vehicles emergency operation can be maintained because the aggregates on either side can be coupled to one another. EP 0 924 132 A2, which is considered to be the closest prior art, describes a drive unit for a tracked vehicle that consists of two drive units arranged on either side of the vehicle body. Each drive unit has a drive motor, which drives an electric generator. The drive tracks can be driven by associated electric motors.

[0004] DE 195 37 945 A1 shows a drive unit for a tracked vehicle, in which the power is divided among 4 motors.

[0005] The purpose of the invention is to provide a drive unit for a tracked vehicle, which ensures greater reliability and operating security even when the vehicle is partially damaged. In addition, standard components and aggregates of suitable structural volume should be able to be used.

[0006] This objective is achieved by a drive unit for tracked vehicles, which also embodies the features of the characterizing portion of the principle claim.

[0007] According to the invention, a first and a second right-hand electric drive motor are associated with the right-hand drive track and a first and a second left-hand electric drive motor are associated with the left-hand drive track. The two first drive motors are fed by a first generator and the two second drive motors are fed by a second generator.

[0008] The result is that if any component of the drive unit is out of action, the tracked vehicle can still be driven and steered. For example, if the first internal combustion engine or the first generator is out of action, the second combustion engine and the second generator, and the second left-hand and second right-hand drive motors are still there to drive the two drive tracks. If one or both first drive motors or one or both second drive motors fail, there is still a drive motor available to drive each drive track.

[0009] In an advantageous embodiment of the invention, each drive track is associated with a summation unit by means of which the drive power respectively of a first and a second electric drive motor is coupled to a track drive wheel. Compared with an arrangement in which each drive track is respectively driven by a front and a rear track drive wheel, this has the advantage that stresses in the drive track are avoided.

[0010] If the generators and electric drive motors are alternating-current machines, the energy paths can advantageously be wired as follows: the output of the first generator is connected electrically to the input of a first rectifier. The output of the second generator is electrically connected to the input of a second rectifier. The output of the first rectifier is simultaneously connected electrically to the input of a first left-hand and a first right-hand DC/AC converter. The output of the second rectifier is simultaneously connected electrically to the input of a second left-hand and a second right-hand DC/AC converter. The output of each DC/AC converter is connected electrically to the input of an associated drive motor.

[0011] The invention is described in greater detail with reference to the attached figure, which illustrates schematically the components of the drive unit and their wiring. In the figures the left-hand and right-hand drive tracks are indexed 2 and 4, respectively. The generators 6, 8 are designed as alternating-current machines and are driven by an internal combustion engine 10, 12 in each case. The right-hand drive track 4 is associated with a first right-hand electric drive motor 14 and a second right-hand drive motor 16. The left-hand drive track 2 is associated with a first left-hand electric drive motor 18 and a second left-hand electric drive motor 20. The two first drive motors 14, 18 are fed by the first generator 6 and the two second drive motors 16, 20 are fed by the second generator 8. All the electric drive motors are alternating-current machines. A reducing gear train 22, 24, 26, 28 is associated with each electric drive motor.

[0012] Via the reducing gears 22, 24 the two right-hand drive motors 14, 16 drive a right-hand summation gear 30, while the two left-hand drive motors 18, 20 drive a left-hand summation gear 34 via the reducing gears 26, 28. Via these summation gears the drive power, in each case of a first electric drive motor 14,18 and a second electric drive motor 16, 20, is coupled to a track drive wheel 50, 52.

[0013] The output of the alternating-current generator 6 driven by the first combustion engine 10 is connected electrically to the input of a first rectifier 58. The output of this rectifier 58 is divided into two paths. It is connected electrically, simultaneously to the input of a first left-hand DC/AC converter 60 and a first right-hand DC/AC converter 62. The output of the first left-hand DC/AC converter 60 is connected to the input of the first right-hand electric drive motor 18. The output of the first right-hand DC/AC converter 62 is connected to the input of the first right-hand electric drive motor 14. The second generator 8, the second amplifier 64, the second right and left DC/AC converters 66, 68 and the right and left second electric drive motors 16, 20 are wired in the corresponding way.

[0014] By virtue of the redundant presence of the components and the way they are wired, very great operational security is achieved even when the drive unit is partially damaged. Due to the structure of the drive unit according to the invention, the necessary drive power is produced and transmitted by several small components. Due to the use of components that take up only little space, the structural space available can be used more flexibly. Since no individual component has to be designed to provide all the power required, the components used can be readily available, inexpensive and mass-produced ones. List of index numbers 2 left-hand drive track 4 right-hand drive track 6 first electric generator 8 second electric generator 10 first internal combustion engine 12 second internal combustion engine 14 first right-hand electric drive motor 16 second right-hand electric drive motor 18 first left-hand electric drive motor 20 second left-hand electric drive motor 22 gear train 24 gear train 26 gear train 28 gear train 30 summation gear 34 summation gear 50 track drive wheel 52 track drive wheel 58 first rectifier 60 first left-hand DC/AC converter 62 first right-hand DC/AC converter 64 second rectifier 66 second left-hand DC/AC converter 68 second right-hand DC/AC converter 

1. Drive unit for a tracked vehicle with a first and a second electric generator (6, 8) and with a first and a second internal combustion engine (10, 12), such that one generator (6, 8) can be driven respectively by one combustion engine (10, 12) and with electric drive motors (14, 16, 18, 20) for driving a right-hand and a left-hand drive track (4, 2), such that elements of the drive unit are linked together, characterized in that the right-hand drive track (4) is associated with first and second right-hand electric drive motors (14,16), the left-hand drive track (2) is associated with first and second left-hand electric motors (18, 20), the two first drive motors (14, 18) being fed by the first generator (6) and the two second drive motors (16, 20) being fed by the second generator (8).
 2. Drive unit according to claim 1, characterized in that each drive track (2, 4) is associated with a summation unit (30, 34) by means of which the drive power, in each case of a first and second electric drive motor (14, 18, 16, 20), is coupled to a track drive wheel (50, 52).
 3. Drive unit according to claims 1 or 2, characterized in that the generators (6, 8) and the electric drive motors (14, 16, 18, 20) are alternating-current machines, the output of the first generator (6) is connected electrically to the input of a first rectifier (58), the output of the second generator (8) is connected electrically to the input of a second rectifier (64), the output of the first rectifier (58) is connected electrically simultaneously with the input of a first left-hand and a first right-hand DC/AC converter (60, 62), the output of the second rectifier (64) is connected electrically simultaneously to the input of a second left-hand and a second right-hand DC/AC converter (66, 68), and the output of each DC/AC converter (60, 62, 66, 68) is electrically connected to an associated drive motor (18, 14, 20, 16). 